IS 4253 (Part 2) : 2008 ~2~~XiR ( ii '<"1'<1 g;Rterur ) Indian Standard CORK COMPOSITION SHEETS - SPECIFICATION PART 2 CORK AND RUBBER ( Second Revision) ICS674.833: 621-762.4 OBIS 2008 BUREAU OF INDIAN STANDARDS MANAK BHAVAN . 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 November 2008 Price Group 4 Gasket and Packing Sectional Committee, MED 30 FOREWORD This Indian Standard (Part 2) (Second Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Gasket and Packing Sectional Committee had been approved by the Mechanical Engineering Division Council. This standard was originally published in 1968 and subsequently revised in 1980. In this revision Amendments No. I to 3 have been incorporated. The clauses with regard to sampling, dimensions, compressibility and recovery, flexibility test and fluid resistance have been modified. The composition of the Committee responsible for the formulation of this standard is given in Annex B. For the purpose ofdeciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the results of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 'Rules for rounding off numerical values (revised)' . The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. AMENDMENT NO. 1 OCTOBER 2010 TO IS 4253 (PART 2) : 2008 CORK COMPOSITION SHEETS -- SPECIFICATION PART 2 CORK AND RUBBER ( Second Revision ) (Page 5, Table 1, col heading 6) -- Substitute 'RC50 -B'for 'RC50-A'. {Page 5, Table 1, col heading 7) -- Substitute 'RC70-B' for 'RC70-A'. (Page 5, Table 1, col heading 8) -- Substitute 'RC80-B' for 'RC80-A'. (Page 5, Table 1, col heading 9) -- Substitute 'RC50-C' for 'RC50-A'. (Page 5, Table 1, col heading 10) -- Substitute 'RC70-C 'for 'RC70-A'. (Page 5, Table 1, col heading 11) -- Substitute 'RC80-C' for 'RC80-A'. ( M E D 30) Reprography Unit, BIS, N e w Delhi, India IS 4253 (Part 2) : 2008 Indian Standard CORK COMPOSITION SHEETS - SPECIFICATION PART 2 CORK AND RUBBER ( Second Revision) I SCOPE 1.1 This standard (Part 2) specifies requirements for cork composition sheets for gaskets made by the compounding of granular cork with natural or synthetic rubber. 1.2 Three types of sheets are covered, and within each type , three grades. Type A is non-oil res istant , Type B has a good resistance to oil , and Type C has a very good res istance to oils and petrol. 2 REFERENCES IS No. . Title (Part 10) : 1977 Compression set at constant strain (first revision) 4202 : 1967 Method for determination of chloride content of textile materials Method for decermination of SUlphate content in textile materials 4203 : 1967 3 MATERIALS AND FINISH The follow ing standards contain provisions, which through reference in this text , constitute provisions of th is standard. At the time of publ ication the editions indicated were valid . All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below: 3.] The cork used for the manufacture of cork composition sheets shall be clean soft grade type uniformly granulated and practically free from hardboard , wood flour, dust, and other foreign material likely to be detrimental to the serv iceability of the gaskets . The finished material shall be free from cracks or pinholes and shall be capable ofbeing cut or punched without cracking or tearing. 3.2 Unless a particular grain size is specified by the purchaser, the size of the cork granules used shall be that which the manufacturer considers most suitable for the particular application. The granules shall be classified as follows: a) Fine b) Medium c) Coarse Passing through 1.00 mm IS Sieve and retained on 425 micron IS Sieve Passing through 2.00 mm IS Sieve and retained on 1.00 mm IS Sieve Passing through 3.35 mm IS Sieve and retained on 2.00 mm IS Sieve IS No. 335: 1993 460 Title New insulating oils (fourth revision) Specification of test sieves : Wire cloth test sieves (third revision) Perforated plate test sieves (third revision) Sampling inspection procedures: Part I Attribute sampling plans indexed by acceptable quality level (AQL) for lot-by-Iot inspection (third revis ion) Specification for external micrometer (first revision) Methods of test for vulcanized rubber: Rubber, vulcanizedor thermoplastic - Determination of Hardness (Hardness between 10 IRHD and 100 IRHD)(third revis ion) (Part I): 1985 (Part 2) : 1985 2500 (Part I) : 2000 NOTE - For the Indian Standard Sieve designations and their equivalents according to BS, ASTM, Tyler, French and German Standards [see IS 460 (Part I ) and IS 460 (Part 2»). 2967 : 1983 3400 4 THICKNESS (Part 2) : 2003 4.] Standards preferred thicknesses are 1.0 mm, 1.2 mm, 1.5mm, 1.8 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 7.0 mm, 8.0mm, 9.0 mm, 10.Omm, I I.Omm, 12.0 mm, 13.5mm and 15.0mm. Any other thickness may be used as agreed to between the purchaser and the manufacturer. IS 4253 (Part 2) : 2008 4.2 The permissible variation in thickness at any point on the sheet shall be ± I0 percent, for thickness up to 2.50 mm and ±0.25 mm for thickness above 2.50mm. exposure to heat and immersion in water. 8.3.2.1 Testing for dimensional stability to low humidity Expose three prepared specimens in a forced hot-air oven set at 100 ± 2·C for 5 h. Remove spec imens and allow to cool between 21· to 30·C in a desiccator containing anhydrous-calcium chloride or suitable desiccant material. Remeasure and record measurements as final readings. 5 TYPESANDGRADES The various types and grades of cork composition shall be identified by the designations given in Table I, in accordance with their properties. 6 PROPERTIES Cork composition sheets, when subjected to the conditioning procedure and the appropriate test as given in 8 shall have the properties given in Table I. 7 SAMPLING 8.3.2.2 Testing for dimensional stability to high humidity Immerse three prepared specimens into a tray of deionized water to a depth of 12 rnm for a 22 h period . For materials that are buoyant in water, a supported wire screen or expanded metal cover should be used with adequate weights to keep the specimens immersed at the specified depth. Be certain that the specimens are separated and able to expand in an unrestricted fashion. Remove specimens from water and lightly blot excess water from the surface of the specimens. Remeasure and record measurements as final readings. The sampling plan shall be as mutually agreed to between the manufacturer and the purchaser, in respect of tests to be conducted. In the absence of such agreement the sampling plan given in Annex A shall be followed . 8 TESTS 8.1 Conditioning All test samples shall be conditioned in an atmosphere of65 ± 2 percent relative humidity at 27 ± 2°C for 48 h prior to testing. Testing is preferably carried out in the standard atmosphere and shall be so performed in cases of dispute. 8.2 Dimensions The thickness shall be measured by Grade 2 micrometer having an anvil of not less than 10 mm diameter (see IS 2967) or by Vernier. The thickness shall be within the variation specified at 4.1. 8.3 Dimensional Stability 8.3.1 Sixtestspecimens at least of size 150mm x 150mm shall be drawn from each sheet in the sample. At least six test specimens should be taken for each sample material, three for the high humidity and three for the low humidity tests . The samples should be cut 25.4 mm wide, and between 20 mm and 30 mm in length. The long direction should be in the direction that experiences the greatest dimensional change, generally the cross machine or against the grain direction. If there is doubt, both directions should be sampled, and the results of the direction with the greatest change reported. 8.3.3 Calculation of Results Report the results as percent change to high or low humidity calculated from the following equations: High humidity L L r -L j LI L, -L; L x 100 Low humidity where Lj L. I x 100 initial length, final length, and change in length, in percent. L, L Calculate and report the average of the three individual specimens. Average percentage change of three specimens for low humidity and high humidity each shall meet the dimensional change requirements. 8.4 Tensile Strength Three test specimens shall be cut from each sheet in the sample and tested for tensile strength on a tensile testing machine. The specimens shall be cut with a die or other suitable means to give clean cut edges. The specimens shall be 25 mm wide and 100 mm long and there shall be at least 30 mm grip in each jaw. The rate oftraverse ofjaw shall be 300 ± 30 mm/min. Load shall be applied and tensile strength calculated, in kPa. Where the test specimen breaks at the jaws the readings shall be disregarded. The average value 2 8.3.2 Procedure Measure test specimens to ±0.025 rnm and record values as initial readings. If the test specimen is marked for identification or measurement, be certain that the mark is easily visible and will withstand IS 4253 (part 2) : 2008 oftensile strength shall not be less than that specified in Table I for that type and grade. 8.5 Compressibility and Recovery This shall be determined on any convenient apparatus which has two flat parallel platens. Overlapping the test specimen by at least 6 rom at any time between which the material can be placed and compressed and the movement of which shall be measured with a micrometer dial gauge or other suitable means . In case of sheets thicker than 6 mrn, the thickness shall be brought down to 6.00 ± 0.2 mm. 8.5.1 Test specimens preferably circular ones cut from several random positions of the sheets in the sample, shall have an area of400 mm! ± 5 percent. 8.5.2 The test specimen conditioned as outlined in 8.1 shall be placed between the platen and its initial thickness I., measured when the preload is ll 7 kPa . The load shall then be increased at a uniform rate until the pressure of2 800 kPa is reached within 30 ± lOs after which the load shall be maintained for a further period of 30 ± 5 s. The thickness 12 of the test pieces shall be determined. The major load shall then be reduced to preload (7 kPa) position and after 60 ± 5 s the thickness I J of the test pieces under test shall be measured . The compressibility and recovery shall be calculated as under: Compressibility, percent = II - 12 8.7.1 The test specimens shall be bent through 180· round a mandrel of diameter 3 times the thickness of the specimen for materials up to 3 mm thickness, or 4 times the thickness of the specimen for materials over 3 mm thick, the flexing being carried out at a rate of I min through 180· using figure pressure at ambient temperature. The requirement that there shall be no breakage shall imply no breakage through the granules of cork or separation of the granules .lfany of the test specimens fails then a complete retest with another set of specimens shall be carried out and the material shall be deemed to comply only if all these test specimens show no breakage. 8.8 Fluid Resistance Test Samples preferably of more than 25 mm' area shall be completely immersed by some suitable means in: a) Water for 3 h at 100·C, and b) 35 percent hydrochloric and for 30 min. On removal from fluids, the samples show no dis integration or deterioration in case of water and a slight deterioration in case of35 percent hydrochloric acid. For Type B and Type C immersion test in ASTM Oil No.3 for 70 h at 100·C requirements mainly for automotive industry: For Type B, change in volume - 25 percent, Max b) For Type C, change in volume - 15 percent, Max For Type C required in electrical industry immersion test may be conducted in transformer oil as per IS 335 for 70 h at 90·C to loo·C in such cases change in volume should not exceed 8 percent. 8.9 Chemical Test on Water Extract When specified by the purchaser, chemical tests on water extract shall be performed to determine , ifthe material is free from corrosive impurities. 8.9.1 Draw 15 g of the material from each sheet in the sample in the form of cut pieces not larger than 3 mm cube and place them in a chemically resistant glass flask with 300 ml ofdistilled water. Boil for I h under a water-cooled reflux condenser having a ground-glass connection with the flask, after which the flask shall be immediately stopped and cooled to room temperature. Decant a portion of the water extract for determination of pH value . The electrometric method , with glass electrode, shall be used for this purpose. Filter the remainder of the water extract and use 100 ml of thi s for the determination of ch lorides in accordance with 9 of a) I - I I I 2 I X 100 Recovery, percent = x I. 100 The value of the compressibility and recovery shall not be less than those specified in Table I for that grade. ~.6 Compression Set The method of test shall be as described in IS 3400 (Part 10),the temperature oftest being 110· ± 2·C for 24 h and the recovery time shall be I h to 2 h. 8.6.1 Where material is less than 6mm thick, the test specimen should be built up to not to less than 6 mm thickness nor more than 12 mm. 8.6.2 At the end of the compression period the test specimens shall be removed and allowed to rest at room temperature and humidity for an hour before measuring thickness . The values Ofthe compression set shall be as specified in Table I. 8.7 Flexibility Three test specimens (where possible 25 mm wide and of suitable length) shall be cut from each sheet in the sample from widely separated positions. ')lkgf/cm = 98.0665 kPa. 2 3 IS.c15J(hrt 2): 2001 IS 4202 and another 100 ml for determ ination of sulphates in accordance with 9 of IS 4203 . The pH value , and the values of the chlorides and sulphate contents shall be as given in Table I. NOTES The marking of the grades shall be such that it may be readily identified on a piece of 300 mm cut from any position of the sheet. 10.2 BIS Certification Marking x 300 mm I For chlorides usc the formula liven In 9.2.3(a) of IS 4202 1 For svlphatcs usc the formula liven IS 4203 . In Cork composition sheets may also be marked with the Standard Mark. 10.2.1 The use of Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and Rules and Regulations made thereunder. The details of conditions under which the licence for the use of Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. 9.2.3(a) of 9 FUNGUS-PROOFING When required by the purchaser. the cork composition sheets shall be treated to provide complete protection against microbiological attack by complete immersion in a suitable fungic ide (such as a solution ofp-nitrophenol or pentachlorophenol) for not less than 2 min followed by draining and drying. 10 MARKING 11 PACKING Cork composition sheets shall be suitably packed to prevent damage. 12 STORAGE 10.1 Cork composition sheets shall be marked with the following : a) b) c) Manufacturer's name or trade-mark (if any), Date o f manufacture. and Grade . Cork composition sheets shall not be stored under conditions of temperature, humidity or for reasonable period of time, which are likely to cause deterioration. ANNEXA (Clause 7) SCALE OF SAMPLING AND CRITERIA FOR CONFORMITY A·I SCALE OF SAMPLING in one order as I, 2, 3 .. .etc, up to r and so on. where'r' is the integral part of Ntn (N being the number of items in the lot and n the number of items to be selected). Every 'rth' item thus counted shall be withdrawn to constitute the sample. A-1.2.2 If the cork composition sheets are packed in different packages, a suitable number of packages (not more than 20 percent of the total in the lot) shall be selected at random and the required number of cork composition sheets shall be drawn. as far as possible. equally from the packages selected. A-2 NUMBER OF TESTS AND CRITERIA FOR CONfURMITY After conforming dimensional requirements. a number of cork composition sheets (as per special inspection level) shall be subjected to the tests for density. tensile strength, compression and recovery. dimensional stability, immersion and water soluble matter. All cork composition sheets in the sample size (special inspection level) shall meet the other requirements of this specification for conforming of the lot. The lot shall be declared conforming to the requi rements of this standard. if it satisfies the above requirements. A·I.I Lot In lin) cons ignment, all the cork composition sheets of the same dimens ions and grade shall be grouped together to constitute a 101. A·1.2 For ascertaining the conform ity of the lot to the requirements of this standard. tests shall be carried out from each lot separately. The number of cork composition sheets to be selected at random for this purpose and shall be according to Table I of IS 2500 (Part I) . Inspection level. general and special. shall be as agreed to between the manufacturer and the purchaser. It shall be ensured that lots containing 2.5 percent or less defect ives will be accepted most of the times for dimensional requirements and no defective will be accepted in case of other requirements. A-1.2.1 To ensure the randomness of selection. random number tables as agreed to between the buyer and the supplier shall be used. In case the tables are not available. the following procedure mav be followed : · Starting from An)" item in the lot count all the items 4 Table 1 Properties of Cork Composition Sheets (Clauses 5, 6, 8.4, 8.5.2, 8.6.2 and8.9.1) SI No. Proptrty Typt A (Non-oil Reliltant) Type B (Good Oil RelillaDt) Type C (Very Good Oil Ruillant) Metbod of Telt, Ref to RCSO·A RC70-A (4) RClO-A (5) (I) i) Hardness. IRIID (2) (3) ROO·A (6) 50 ± RC70·A (7) 70 ± RCSO·A (8) 80 ± ROO-A (9) SO ± RC70-A (10) 70 ± RCSO-A (II) ( 12) IS 3400 (Part 2) . 1995 50 U ± 5 70 ± 5 80 ± 5 5 5 5 5 5 80 ± 5 ii) Dimensional changes. percent. Max Tensile strength. kPa. Min Compressibility (at 2 1100 kPa). I.S 1.5 I 250 15·30 75 90 U I.S 1.5 I 550 25-35 75 90 I.S 1.5 I 550 25-35 llO ll5 1.5 I 900 15·25 75 90 Se« 7.3 Su 7.4 See 7.5 Se« 7.~ iii) 650 45·65 80 90 900 700 45 -60 80 110 I 250 35·50 80 85 I 250 35-45 80 80 iv) v) vi) percent Recovery, percent, MIn Compression set, percent, MlU Chemical lcsl on water extract: a) pH. where applicable h) Chloride con lent (as chloride ion) c) Sulphate content (as sulphate ion) 30·45 110 90 v. vii) Se« 7.6 50 to 11 .5 02 percent. Mar 0.2 percent. Mar 5.0 10 85 0.2 percent. Mar 0.2 percent . Max 50 to II 5 o 2 percent. Ma x Su 7.9 o2 percent. Mar Gasket. suitable for Genenl purpose only Lisht electrical and industry Automotivc mdustry automotive Lip" clec1rical and general automotin mdustry Automotive mdust!) Iii smeraJ Heavy electrical Industf) Ship building and mamtenance Aircraft mdust!) .... - ~ '1 :l I IS 4253 (part 2) : 2008 ANNEXO (Foreword) COMMfITEE COMPOSmON Gasket and Packing Sectional Committee, MED 30 Orgallizatioll Representativets) SHRI Am K . BANTHIA SHRI V. K . GUPTA SHRI S . SELVAKUMAR (Alterna te) lIT Kbarqpur, West Bengal 8IDco Products (India) Ltd, Vadodara (Chairmall) Bbant Bijlce Ltd, Mumbai SHRJR. S. MlJRALEEIlHARAN SHRI V. D . DEODHAR (Altemote) Bbant Corrub Industries, Vadodara SHRJB . M . TOUA SHRI S. MOHAN (Alternate) Bba'al Heavy Electricals Ltd, Tiruchirappalli CI'OIIIJlWII Greaves Ltd, Mumbai Department of Industrial Policy &: Promotion, New Delhi Femcr (India) Ltd, M.durai Ferolite Joinlings Ltd, Ghaziabed SHRJ S. KUMAR SHRI A. V. NARASINGA RAo(Alternate) SHRJ P. S. RAMACHANDRAN SHRJ SIWSH KUMAR SHRI M . Z . KHAN (Alternate) SHRJ V. SRINIVASAN SHRI SHRI R. P. D . R. Boss (Alternate) SHRI AKsKAy SHARMA F. C. SHARMA (Alternate) Hindusun Petroleum Corporation Ltd, Visakhapatnam SHRI Y. SRIRAMULU SHRI S . CHAKRAOHAR (Alterna te) ff>'4era1*11ndustries Ltd, Ballabprtt (Faridabed) SHRI (DR) SHRI V. K. SINGH ISSAR iAltemate] ARUN HiP. EnBineers Pvt Ltd, Chennai SHu G. GANfSAN SHRI A. V. PAR11lASAJmIY (Alternate) SHRI A. D. DANI SHRI R. L. HAROUKAR (Alternate) Nu-Cork Products Pvt Ltd, Gurgaon 0rd0Ince Factory Bo.rd, Jabalpur Raan:b, DesiBJIS and Standards Organization, Lucknow SHRI S. K. DAlTA SHRI RA.INJsH LoDWAL SHRI M. K . MISHRA SHRI A. K . MANDAL SHRJ I. S. DAS (Alternate) (Alternate) Rites Ltd, Gurpon Supcrlite Jointinp Pvt Ltd, Ghaziabed SHRI S . B. MAUK SHRJ D . K . S ING! SHRI S . K . DAVE SHRJM ADHUKAR SINGH (Alternate) (Alterna te) Super Waudite Jointing Pvt Ltd, Ahmedabad SHRI Piw>EEP 1. PANDYA SHRI C . D . GAZDAR (Alternate) Talbros Private Ltd, Faridabad SHRI BAUW T ANWAR SHRJPARVEEN SHARMA (Alternate) Tita Power Company Ltd, Mumbai SHRI AsHoK SE11lI SHRI V. V. NAMJOSHI (Alternate) 6 IS 4253 (part 2) : 2008 Organization The Premier Automobiles Ltd, Mumbai Representativets) SHRI P. P. KINI SHRI BIIARAT BHUSHAN (Alternate) SH~ Uni Klinger Limited, Pune Victor Gaskets India Ltd, Nasik S.K.KAGALKAR SHRI M.S. SHANKAR SH~ DluPPA LVE (Alternate) SHRI C. K. VEDA, Scientist'F' & Head (MED) (Representing Director General (Ex-officio» BIS Directorate General Member Secretary SHRI T. V. SINGf Scientist 'E' (MED), BIS 7 .B ureau orIndian Standards BIS is a statutory institution established under the Bureau ofIndian Standards Act, 1986to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to conncc:tcd matters in the country. Copyright BIS has the copyright ofall its publications. No part ofthese publications may be reproduced in any form without the prior permission in writing ofBIS. 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Amendments Issued Since Publication AmendmentNo. Date of Issue TextAffected BUREAU OFINDIAN STANDARDS Headqual1en: ManakBhavan,9 BahadurShah lafar Marg,New Delhi 110002 Te1cpbooe:s:2323 0131,2323 3375,23239402 Website: www.bis.org.in RqioDaIOffices: Telegrams: Manaksanstha (Commonto all offices) Telephones 23237617 { 23233841 23378499,23378561 { 23378626,23379120 2603843 { 2609285 2254 1216,2254 1442 { 22542519,22542315 28329295,28327858 { 28327891 ,28327892 CcntraI : Eastern: Northern : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEWDEl.1llII0002 1/14,C.I.T. Scheme VII M. V.J.P. Road, Kankurgachi KOLKATA700054 sea 335-336,Sedor34-A, CHANDIGARH 160022 Southern: C.I.T. Campus, IVCross Road,CHENNAI600113 Western: Manakalaya,E9 MIDC, Marol,Andheri (East) MUMBAI 400093 Branches: AHMEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR . KANPUR. LUCKNOW. NAGPUR. PARWANOO. PATNA. PUNE. RAJKOT. THIRUVANATHAPURAM. VISAKHAPATNAM. 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